Software tarballs saved as symlinks if already in filesystem

Until now, if the software source tarballs already existed on the system
they would be copied inside the project. However, the software source
tarballs are sometimes/mostly larger than their actual product and can
consume significant space (~375 MB in the core branch!).

With this commit, when the software are present on the system, their
symbolic link will be placed in 'BDIR/software/tarballs', not a full
copy. Also, because the tarballs in software tarball directory may
themselves be links, we use 'realpath' to find the final place of the
actual file and link to that location. Therefore if 'realpath' can't be
found (prior to installing Coreutils in Maneage), we will copy the tarballs
from the given software tarball directory. After Maneage has installed
Coreutils, the project's own 'realpath' will be used. Of course, if the
software are downloaded, their full downloaded copy will be kept in
'BDIR/software/tarballs', nothing has changed in the downloading scenario.

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